#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_COLS 20
#define MAX_INPUT  1000

int read_column_numbers(int columns[], int max);

void rearrange(char *output, char const *input,
               int n_columns, int const columns[] );

int main(void)
{
    int n_columns;
    int columns[MAX_COLS];
    char input[MAX_INPUT];
    char output[MAX_INPUT];

    n_columns = read_column_numbers(columns, MAX_COLS);
    while (gets(input) != NULL) {
        printf("Original input: %s\n", input);
        rearrange(output, input, n_columns, columns);
        printf("Rearranged line: %s\n", output);
    }
    return EXIT_SUCCESS;


}

int read_column_numbers(int columns[], int max)
{
    int num = 0;
    int ch;

    while (num < max && scanf("%d", &columns[num]) == 1 && columns[num] >= 0) {
        num += 1;
    }
  
    if (num %2 != 0) {
        puts("Last column number is not paired!");
        exit(EXIT_FAILURE);

    }

/* while( (ch = getchar()) != EOF && ch != "\m")
    ;
*/
    return num;
}

void rearrange(char *output, char const *input,
               int n_columns, int const columns[])
{
    int col;
    int output_col;
    int len;
    len = strlen(input);
    output_col = 0;

    for (col = 0; col < n_columns;col +=2) {
        int nchars = columns[col + 1] - columns[col] + 1;

        if (columns[col] >= len || output_col == MAX_INPUT - 1) {
            break;
        }

        if (output_col + nchars > MAX_INPUT -1 ) {
            nchars = MAX_INPUT - output_col - 1;
        }

        strncpy(output + output_col, input + columns[col], nchars);
        output_col += nchars;
    }
    output[output_col] = "\0";
}
